US4404056A
Expired / Lapsed
US
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Method of joining waterproof vulcanized synthetic rubber sheets
Assignee: Mitsuboshi Belting Ltd
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Filing: 1981-02-25
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Granted: 1983-09-13
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Expires: 2001-02-25
Abstract
Abstract A method for joining waterproof vulcanized synthetic rubber sheets is described wherein a cold-vulcanizable adhesive tape having Mooney viscosity [ML 1+5 (100° C.)] of from 5 to 25 and an autoadhesion property, and which contains a rubbery polymer comprising (1) ethylene-propylene terpolymer, butyl rubber, or a blend of ethylene-propylene terpolymer and butyl rubber, (2) a vulcanizing agent, (3) a vulcanization accelerator, (4) an adhesive agent, and (5) a softening agent is placed between overlapped areas of the waterproof vulcanized synthetic rubber sheets, and said adhesive tape is cold-vulcanized to thereby join the sheets.
Inventors
- 👤 Masanori Kakehi
- 👤 Yoshitaka Higashida
- 👤 Kenzo Iwamoto
- 👤 Hikaru Kano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/128; C09; C09J; C09J123/00; C09J123/02; C09J123/16; C09J123/18; C09J123/20; C09J123/22; C09J5/00; C09J5/10; C09J7/00; C09J7/10; C08J2321/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A method for joining waterproof vulcanized synthetic rubber sheets wherein a cold-vulcanizable adhesive tape having a Mooney viscosity (ML 1+5 (100° C.)) of from 5 to 25 and an autoadhesion property, and which is prepared from a blend of (1) 100 parts by weight of a rubbery polymer, (2) from 1 to 2 parts by weight of an oxime vulcanizing agent or from 1 to 3 parts by weight of sulfur or a sulfur-containing vulcanizing agent, (3) from 3 to 4 parts by weight of a PbO 2 vulcanization accelerator in the case of using an oxime vulcanizing agent or from 2 to 6 parts by weight of a thiazole, thiuram, or dithiocarbamate vulcanization accelerator in the case of using a sulfur or sulfur-containing vulcanizing agent, (4) from 30 to 100 parts by weight of an adhesive agent, and (5) from 30 to 150 parts by weight of a softening agent, is placed between overlapped areas of waterproof vulcanized synthetic rubber sheets and pressed to provide an initial adhesive strength of from 0.5 to 3 kg/25 mm, and the adhesive tape is cold-vulcanized to join the sheets.
Claim 2
Independent Claim
187 words
A method for joining waterproof vulcanized synthetic rubber sheets wherein a cold-vulcanizable adhesive tape having a Mooney viscosity (ML 1+5 (100° C.)) of from 5 to 25 and an autoadhesion property, and which is prepared from a blend of (1) 100 parts by weight of a rubbery polymer, (2) from 1 to 2 parts by weight of an oxime vulcanizing agent or from 1 to 3 parts by weight of sulfur or a sulfur-containing vulcanizing agent, (3) from 3 to 4 parts by weight of a PbO 2 vulcanization accelerator in the case of using an oxime vulcanizing agent or from 2 to 6 parts by weight of a thiazole, thiuram, or dithiocarbamate vulcanization accelerator in the case of using a sulfur or sulfur-containing vulcanizing agent, (4) from 30 to 100 parts by weight of an adhesive agent, and (5) from 30 to 150 parts by weight of a softening agent, is placed between overlapped areas of waterproof vulcanized synthetic rubber sheets and pressed to provide an initial adhesive strength of from 0.5 to 3 kg/25 mm, and the adhesive tape is cold-vulcanized to join the sheets.
Claim 3
Dependent Claim
21 words
A method as in claim 1, wherein the vulcanizing agent is an oxime and the vulcanization accelerator is PbO 2 .
Claim 4
Dependent Claim
29 words
A method as in claim 1, wherein the vulcanizing agent is selected from sulfur and sulfur-containing vulcanizing agents, and the vulcanization accelerator is selected from thiozoles, thiurams, and dithiocarbamates.
Claim 5
Dependent Claim
74 words
A method as in claim 1, 2, or 3, wherein the rubbery polymer comprises an ethylene-propylene terpolymer, butyl rubber, or a blend of an ethylene-propylene terpolymer and butyl rubber, and the cold-vulcanizable adhesive tape is prepared at the job site by charging components (1)-(5) into a mixing extruder from which a tape as wide as the overlapped areas of the waterproof sheets is extruded and placed between the overlapped areas of the waterproof sheets.
Claim 6
Dependent Claim
21 words
A method according to claim 1 or 2 wherein the vulcanizing agent is selected from p-quinone dioxime, and p,p'-dibenzoyl quinone dioxime.
Claim 7
Dependent Claim
22 words
A method according to claim 1 or 3 wherein the vulcanizing agent is selected from morpholine disulfide, phosphorus-containing polysulfide and sulfur chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |